It's a Bluetooth board for the Paper-Duino-Uno or the Duino-Mini. It's based on the Bluetooth Module RS232/TTL HC-05. It is a Master and Slave integrated Bluetooth serial module:

The default setting for the serial port is: 9600, N, 8,1 and the password is: 1234.
There are two versions, one for the Paperduino-UNO and one for the Paper-Duino-Mini. For the UNO board on has to modifier the power jumper that the Blutooth board is powered over the external power.
Front:

Back:

For the Paper-Duino-Mini and the Fabric-Duino:

duino-mini-bluetooth_02.ai.zip
And for the Paperduino-UNO:

paper-duino-bluetooth_01.ai.zip

• HC-05 Module
• Diode 1N4007
• Cap 100nF
• Resistors: 2x 470 Ohm, 1x 1 Kohm, 1x 2kOhm, 1x 10 kOhm
• 2x LED
• Connector

The Duino-Bluetooth-Board was designed by Wolfgang Spahn 2016.
It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.